[열혈 C++] 문제 03-2 문제1 풀이

계산기 기능의 Calculator 클래스를 정의해 보자. 기본적으로 지니는 기능은 덧셈, 뺄셈, 곱셈 그리고 나눗셈이며, 연산을 할 때마다 어떠한 연산을 몇 번 수행했는지 기록되어야 한다. 아래의 main 함수와 실행의 예에 부합하는 Calculator 클래스를 정의하면 된다. 단, 멤버변수는 private으로, 멤버함수는 public으로 선언하자. 이렇게 선언하는 이유에 대해서는 다음 Chapter에서 자세히 언급한다.

int main(void)
{
Calculator cal;
cal.Init();
cout << "3.2 + 2.4 = " << cal.Add(3.2, 2.4) << endl;
cout << "3.5 / 1.7 = " << cal.Div(3.5, 1.7) << endl;
cout << "2.2 - 1.5 = " << cal.Min(2.2, 1.5) << endl;
cout << "4.9 / 1.2 = " << cal.Div(4.9, 1.2) << endl;
cal.ShowOpCount();
}

[실행의 예] 3.2 + 2.4 = 5.6 3.5 / 1.7 = 2.05882 2.2 - 1.5 = 0.7 4.9 / 1.2 = 4.08333 덧셈: 1 뺄셈: 1 곱셈: 0 나눗셈:2

 

 

[풀이]

#include <iostream>
using namespace std;

class Calculator
{
private:	// 카운트
	int addCount = 0;
	int minCount = 0;
	int mulCount = 0;
	int divCount = 0;
public:
	void Init();
	double Add(double num1, double num2);
	double Min(double num1, double num2);
	double Mul(double num1, double num2);
	double Div(double num1, double num2);
	void ShowOpCount();
};

void Calculator::Init()
{
	addCount = 0;
	minCount = 0;
	mulCount = 0;
	divCount = 0;
}
double Calculator::Add(double num1, double num2)
{
	addCount++;
	return num1 + num2;
}
double Calculator::Min(double num1, double num2)
{
	minCount++;
	return num1 - num2;
}
double Calculator::Mul(double num1, double num2)
{
	mulCount++;
	return num1 * num2;
}
double Calculator::Div(double num1, double num2)
{
	divCount++;
	return num1 / num2;
}
void Calculator::ShowOpCount()
{
	cout << "덧셈: " << addCount << ' ';
	cout << "뺄셈: " << minCount << ' ';
	cout << "곱셈: " << mulCount << ' ';
	cout << "나눗셈: " << divCount << ' ';
}

int main()
{
	Calculator cal;
	cal.Init();
	cout << "3.2 + 2.4 = " << cal.Add(3.2, 2.4) << endl;
	cout << "3.5 / 1.7 = " << cal.Div(3.5, 1.7) << endl;
	cout << "2.2 - 1.5 = " << cal.Min(2.2, 1.5) << endl;
	cout << "4.9 / 1.2 = " << cal.Div(4.9, 1.2) << endl;
	cal.ShowOpCount();
}